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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b786c651eddea28b71887aa9f74865437077fec452afc8833fc13140148f3017' 
  AND token = 'i8kcPFvhnpC8giSFCbpIiH3MC1kZCDdO91Jmfi1kR2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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