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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf47d60c19a3e3303a56af629809f6f7a9e47d0b5aae0affb6134140557928d' 
  AND token = 'p1PiqsWfapqWUSeXwfvvouhc83a1W4jnC3+azLCFXWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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