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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b268a50de82e049a34c6bd9bd79a4699757a473b40ae1f98b8d016f956ff95' 
  AND token = '8Mps7p31RXfFNRK16yQ6HuYpRvBmATK99T+xBkK7XIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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