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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735ba4824372e752cfc4783ca0229c4fa165061355057fc6ca04bd107f0365a9' 
  AND token = 'XiDuteIrqLPzPj/zcl1tjm+kanxWg1gNnxazGvwpdoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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