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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad24627469a799e8c4f248b3b0bc1393a1760cf0c809d187e0bdb9d3c0e73a7' 
  AND token = 'KHJANOHftQ/77Qz0sE/uyPl0RjN86du3UNkN72aleS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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