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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7590426c16967cb0926828f353cb1eebfdb9fc6c69686a7d6821a0e993ffb5a0' 
  AND token = '3zbfEI1458bG7IXtuAXkca7Sq9oQbxYjnH9JoqTL0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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