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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e52aed4ced961d3c989d92e4854cfb92804b039e28abba7aa15ca28756aefb' 
  AND token = 'ylfTs7qm8qt1aLQli5EOrNQ7qBsQcGlLAX0F1vnUD68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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