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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a21d66471774cd5c7af62c2a5eea4325822a9e5b07d4626f42a312cf24e5ef7' 
  AND token = 'GxoBHqBf2IcwF9rud7ca9lvWClHf6nN16PPdkwjDr3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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