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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676627564d3e0fb0216c0340beea5e9d535058c1d410e62fdd4227917e46c02a' 
  AND token = '1b3Ds46DvzysEl8g39p2bKOKzGmiGCYA48onBx1io0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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