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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5bc7b863511bf4a9b51dac805cb881484340add8aae1fe80ba3085c1b01540' 
  AND token = '0HCz+Q1q86pgYDPACU/Sv0OkJNWTpqcKUEAgu0U/fls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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