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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fccea303a24728ca214c294f85e6e3eb5392028b4df8406415c731e1cc20e00e' 
  AND token = 'FWAuyJtslYzRFW3KmTHXUUndzhW4s4Uk3ao/+DPIo0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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