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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8683ef2041c093ed12abbcd3e6a2016a3b72e040639a47bfbf245a9f837c69c' 
  AND token = 'eOjV0HyZeRq853u8l5yz0BoAhQLwWVy9OG8f9tmuKIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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