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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be565af27f529d4350ef8e95ace4258527ff2c4a90c6cb4b29f1b2c37e0b7107' 
  AND token = 'a91vIu8/muQ8SeolNayH6FR8pYKy97seX3E/MAU05Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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