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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6bb3b80533913b0c0353edb96569816802c59631b63cb1d899079147d65e0b' 
  AND token = 'SV9UGlTGXINxei3rf8eXWpeLscfOb2UF3oCSfUKvaBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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