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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e7d36950b28c6e1ffcbdc3a58f0a64da79db47c8673208d65e70eb063dcbc5' 
  AND token = 'WNdyriDLT/ODRh90ttUZip598Sov8gdq4jv/zkaKDFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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