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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96567ab50a69ed8f3b04fa0f718ab56cdd7302d59788b6af85802ec16cda7bc6' 
  AND token = '4A3nh3w68HNy+a6Ydi7q1zgWh3ivS57wvTl/fYKdnbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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