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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7b3a131a1e198ae13e440565c9eb3a2600e7d8851eb4c4b771661f8666db9f' 
  AND token = '3pM3Q9Fb1smMtiIRrM0QjDU69vFwrtPvZsRpvqnad5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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