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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee18b4b42a5bbe051b7aa24891e0d6eddb2f447470928a160d0abfd04f93c05f' 
  AND token = 'EjZZ/1bMBbpqN9LjJTAaDOE2jU9Z+CVWbYVxEjYqmzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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