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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7c56202a78d2bd392b1ebcf6f1aba49da66555382b26985bb5f81ac094b04b' 
  AND token = 'l7bRu20Cow8lourQ5oI4cycoHeIYarTQgLqE2Go2eTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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