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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74f99e198d045ddaf731346f7adb0e63f6b58ec0991db6447b79d419327226c' 
  AND token = 'IG3VWH8/UnzPy4eth8j6kFWWp4h8Lo2Z/nkDpqAhC88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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