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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1f3461a80748d429a98fe71904b506c013f518b968a207a30d278783b8b847' 
  AND token = 'Ym8noJWl/zsn+r92ahHR/r4gvKaOBFF8rnDTyLa5Ii8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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