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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a07b9bfc070727c927f74826ebc19c8e951e3ee36e4c5397aa0ff9581ce7c1b' 
  AND token = '4OQjPmxZYHPyGDDBFgERUvBXPmNE0tcW6aNKlxPM9hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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