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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7e68f883828b94f595167336ba6d57da9d3f25ba7e0df909ca5299e4c78105' 
  AND token = '/SmJPoCUROpwccGmBsjDni6xfSoE9ZI8xz2ifi9PBJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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