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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473760dc0e6ab2574cb908f5977c382e3612163a9a42f237a3bc970ee114899' 
  AND token = 'VDz02McMaK1oN/CAtKILrNks2KoCWaVZB6yMJb1Ji94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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