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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8985ae46f708e61206fb51875e39410fed41e0a3cce39ebbdde815510e595321' 
  AND token = '8nz1GuLh9JlfgkBjNCevZJg4Pq4vhNMoSPdO6Hn804E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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