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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa10f8ab9c28310cc7633f09533b500f82eeb256bb23554523f78505b9db095' 
  AND token = 'CDrY6+1PEY3t215pXWvBoLeSqHYSqWzEIGy1RHbxBSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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