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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877c90522e743319c0f20832656ca6c016b393f1e71248c8d685bba3b53593de' 
  AND token = 'fhld18EWVITSdY4Q0NVG3NNqkUvXLkRBtSZyej5n8Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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