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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00feefa2d38d8de309c60f3920d33a4959f7c6e770977a3d89fb9a4b791c0e54' 
  AND token = 'ZBAwGpPLHawVb6CWSB/MPz3k7G8+58nhIIWAMAnqJbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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