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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea35815226bcb9c8a1518229c98271f5ba7897ccedcd40a356cc03a10810be47' 
  AND token = 'dRVo08VWkbWeOr2ZnNE9RXlZgCeDX9UMOPnjNEJkiPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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