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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7596b1984cb809f461d1f7ef93399913adf8f27ce7e9f54d47c15ac527f7cdfa' 
  AND token = 'OQnask9y10U7OuWPfO9th0b6G1sz5/aTA5jyXcGgDNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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