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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04a016c9a4869ef4496d5134819e284fffe595643df9a5063ea63e5bf545f9d' 
  AND token = 'tXrrEqTOxk9KNhP5ieV8FGuHGrokSDvn1BGYoRcrJ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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