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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5da89076e2950a35ac99bd973d42a94a34ccd8fab4081705d49c117137c7dd' 
  AND token = 'aTfMibRd8yUOAYxu3hVy6wvH6pOSAlbNfsPNtgF5VLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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