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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc1566cd42a9dcbfdd7442d9f3cac103a15f414b6df7ae97f07776a94acb2b7' 
  AND token = 'L7TiSuTpeLC20DmnvjvCuX7x3J3Vnk71cpNDqaqqv0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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