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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd5954645cf615b83efe9b8caf71731811056aed3ca7794699f6e957d1e0726' 
  AND token = 'gC9/4ESHTQ+gVOiywI/G8hiVW/OX4UE/Z08lr1rBUMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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