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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce27bf192d982e05e4e9713217dfa18950e0a5a03a43e6e49064c159d66f202' 
  AND token = '6CLU1s9B1Yq11zElOQNgE4ouZ9IhwDh/7u+/4xxkC3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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