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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd85c0d5186ba5ea3f5d7504d7ee5db1f6e1f1e8cb8b71bca0420ca9abbd8ac7' 
  AND token = 'gwpJlszMi78e4RCvmc1W6KaPDISsS7QBhOwAQmyePiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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