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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1605b047ced22c1ae68a07d3057a99d2c6231c9c081d6349eea74b56890283ba' 
  AND token = '7Zv23NR7mMqjPjb9AxuJ01vvkcPK/ICJgWmotyrN7qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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