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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef04741d30a447d241006ab3e1c0f13032a066b0a0539d7aa8441fcf10282fe' 
  AND token = '3jAftBSahVKLvAQF9LtR/eHviW+SZaRVRXw45zZ6azM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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