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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2efa72292f5a1aff1485a3015a41773df2d8d7ac3af7b2e9ac2252c86dcaaf' 
  AND token = '9EERR9KlQPRgb9Y/J83WhPX/xawh19kCQPBD/13M2DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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