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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db06dba6f3367621629a33eb43b51effc5a5bff1ab0d7f691385fa5e8379c31' 
  AND token = 'BCjtF2MxyZyld6QBcJR1b68diyQCs61DGh56oSz0jOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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