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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662598bc5089a34e149bf4b4f0dd6b38b989d388b8cedd3904ac557a9924452d' 
  AND token = '8wUzfGm4yhJHtcV1o6p0DJoU4/L7UG34VKIYIeP1/ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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