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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31ae5079a197a5ff5e47acdb6fab8a64ebf1a2f05d5c50d5ead1dd719000f0d' 
  AND token = 'C8gyr4AbCGXgvbIS6g2tQ5cjioz6YwXo2AJx9aSXAgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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