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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad538c2d24be537be92594bb43f1a41be0135b8fc93598da80e90f7151a5b1b4' 
  AND token = 'vcreZas83L1T2fQaoGElFN6Hp1OYM+jOBPA5tTPV4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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