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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8b3e650efe8234b028664357dea47debfead3dbba710167554bb1226d45065' 
  AND token = 'YXT6/3SJY/bE6DNgYfZPOFwrssErFlyYVJhX/+sYDrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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