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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dda9bbd45fb8029939a4f1a9e8badda0233da02351817919610adc220139cf' 
  AND token = 'WwT/Tn8c7Pcj5hBP9v9eyrWlfbsvaafUoEoMu6blPLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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