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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e957fc3ca64366000f5df3db68a3101f90d9632ee93d69603ebd9858a9b31c' 
  AND token = 'C2+2SK1GpYhXsR+hzzBTyZlhCOl5NWWCLZ4D/c933gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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