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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c7c058da72cfa3fb21d1c4bba03e69ed328a5368971ea3f5f526bba6fc1a07' 
  AND token = 'SlxI9qbWXz6PYVKdWJha0Nr1yAShoYDERAtVWKfJuNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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