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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2479ee5934d375912af77f275a26d6de83e4fbfcfc60d34b35f27ebd9ccf8f' 
  AND token = '8Pp7nCUxu3ukaNQbuGJGGdqzVYFy2RAQDXbh2L2eX2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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