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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a4db6c247137d837398e02567970ec01b757d663ddf81a70039b594d94964d' 
  AND token = '3A1x14Xv97IXwMcOrCRyhXUO+trAY6Nf8f3chD4dY2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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