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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e865a2a72bf80d8ef41d92338600f1c2c75119892a7daa86c8a096e62454f4f8' 
  AND token = '4Kj3tdXTkOPuqpFe8zktrImawTA5aEnXPMphw1L1jNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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