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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35211d97ca4aef16c3e643ac633d8a32ace0eb50a3435b26601b09ab7c2449a2' 
  AND token = 'dA9K6Bjo52/KG17QEnsaAogOx1mdzXhDLSs50c9Z2qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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