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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6c5d157e3c877ff3a57132f978e017d01e486ed0e3c1568f70e0ef98687a2b' 
  AND token = 'A1rwKPchkmt6Ijx6pG1vZEyTIdG9tA+cm01FTmIXDW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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