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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca537049ca21d8c42c9cc451b38f53b1e5da13426bce3be8775c9d2159e92eb' 
  AND token = '5zE30l5919gdTyRS0Tf9D5cmu5uQGmSCXiJtR2v5WFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}